The exercise ball leg tuck hits the lower abs. Grab a exercise ball and set it down on the floor.

About a body length in front of the ball, position yourself with your palms on the floor as if you were going to do a push up.

Point your toes andput your lower legs across the top of the exercise ball.

Straighten your body. This is the starting position.

Keeping your body dead straight, pull your knees up towards your chest.

Extend your legs back to starting position.

Repeat for desired reps.

Exercise Tips:

Increase the difficulty of this exercise by only letting the tips of your toes touch the exercise ball. This makes stability harder, increasing the work needed for your core.